Effects of Suspension Pattern on Operation Reliability of Anti-Icing Polymer Insulators in HVAC Transmission Lines

Abstract

Design and application of anti-icing polymer insulators have been considered as one of effective methods to prevent the icing accretion and icing flashover on outdoor insulators, which is greatly significant to the safety and reliability of power transmission systems. In this paper, according to the actual operation of transmission lines, the wind load and gravity load were calculated under different wind scales. The wind loads and the inclined angles were considered to analyze the axial force of insulator on windward side, the axial force of insulator on legging side and deformation displacement of anti-icing polymer insulators under different meteorological conditions. The obtained results showed that the static axial force distribution, maximum mechanical load and deformation displacement increase with the increase in the wind scales. With increasing the inclined angle of the insulator, the axial tension shows the decreasing tendency from 30° to 60° but then the increasing tendency from 60° to 110°. And the minimum value of axial tension increases gradually with the increase in wind scales. The operation reliability of anti-icing polymer insulators shows the decreasing tendency with the increase in the wind speeds. The optimal suspension pattern with the inclined angle about 60° is also proposed, which can make quantitative optimization analysis on relationship between the typical meteorological condition and operation reliability to improve the reliability and stability of anti-icing polymer insulators in transmission lines.